Many are scared of what they can't see (radiation), which isn't completely indefensible but tends to be exaggerated way beyond the actual risks.

Others are afraid of what they see as "unnatural", not realizing that nuclear fission is so natural that Mother Nature has at least once spontaneously created a fission reactor without the involvement of human hands. (Seriously—it was in Gabon. And there may be more whose remains we haven't found.)

Anyway, the big heavy-water CANDUs like the ones at Darlington are pretty damned safe by my understanding, and should shut down spontaneously under most failure modes. I'd rather live next to one of them than next to a coal plant.